SV-213444r1260206: Microsoft Defender AV must be configured to scan all downloaded files and attachments. | Microsoft Defender Antivirus STIG SCAP Benchmark

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Assessment Title

Rule Text

Microsoft Defender AV must be configured to scan all downloaded files and attachments.

Description

Discussion Text

This policy setting allows configuration of scanning for all downloaded files and attachments. If this setting is enabled or not configured, scanning for all downloaded files and attachments will be enabled. If this setting is disabled, scanning for all downloaded files and attachments will be disabled.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001169SV-89905V-75225

References

DPMS Target Microsoft Defender Antivirus DISA DPMS Target Microsoft Defender Antivirus 3985

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.defenderantivirus:def:19
# Microsoft Defender AV must be configured to scan all downloaded files and attachments.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Intue has enabled the Real-Time Protection to scan all downloads and attachments.
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager').GetValueKind('AllowIOAVProtection').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowIOAVProtection' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowIOAVProtection') -eq 1))
}
# GPO setting 'Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Real-time Protection\Scan all downloaded files and attachments' is 'Enabled' or 'Not Configured'.
# registry_object (registry_test)
function test_2 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Real-Time Protection').GetValueKind('DisableIOAVProtection').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Real-Time Protection' -Name 'DisableIOAVProtection' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableIOAVProtection') -eq 0))
}
# Intune not used.
# registry_object (registry_test)
function test_3 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowIOAVProtection')))
}

if ((test_1 -or (test_2 -and test_3))) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_defender_antivirus target this check assesses.

# oval:mil.disa.stig.defenderantivirus:def:19
$scanDownloads = (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows Defender\Policy Manager" -ErrorAction SilentlyContinue).AllowIOAVProtection -eq 1 -or (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" -ErrorAction SilentlyContinue).DisableIOAVProtection -eq 0
if ($scanDownloads) { Write-Output "PASS"; exit 0 } else { Write-Output "FAIL"; exit 1 }

Remediation

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Real-time Protection >> "Scan all downloaded files and attachments" to "Enabled" or "Not Configured".